Study on Wetting of Coal Dust By Measuring Dynamic Contact Angle

This paper used the optical droplet morphology analysis method(DSA100) to study the dynamic contact angle of coal dust with water and three kinds of surfactants with different concentration,then a dynamic wetting model was established based on the mechanism of liquid wetting coal dust.Study the effects of different concentrations of JFC,SDS and rapid infiltration T in the coal dust on the dynamics of wetting behaves,the results show that: these three wetting agents all have good wetting effects,the JFC have the best wetting ability and the rapid infiltration T have better wetting ability then SDS,0.20% JFC can completely wetting the coal dust in 2 second and 0.30% rapid infiltration T completely wetting the coal dust in 6 second,all the results are good and all the dynamics dates are good fitting with model and most of fitting correlation coefficients were larger than 0.98.Study liquid wetting coal dust with dynamic contact angle method has fast,accurate and simple characteristics.This study can provide theoretical foundation for wetting solid in moving process,such as flotation and dust suppression by spray.